Hy guyz,i just wanna know if I can flash these Rom with locked bootloader and s-of
Yes you can flash a custom with your bootloader on, the difference is you will have to learn how to do everything manually. All my HTC devices have always been s-off and locked with the exception off my last device which I unlocked via HTC Dev
First ensure that your device on its previous rom is rooted.
Download flashify apk from any site preferably apkmonk.
Download the required recovery needed. Recommended TWRp. Make sure you know your device id well and model so you don't download a wrong one and brick your device .eg M7_UL(look for the latest twrp bearing this Id, your can boot into your bootloader and find out your model.
DOWNLOAD and rename the recovery to recovery.Img.
Flash the recovery, it should go smoothly.
Transfer the zip file of the venom rom to your internal SD.
Boot into twrp recovery, clean cache and factory reset, install the zip, follow the aroma instructions and voila
You have Viper One 9.0.0 running on your device